Vision: Floating Point Image support in IMAQ WindDisplayMapping VI

[Andrey_Dmitriev]

Problem Statement:

At this moment there is no way to disable or modify the way the mapping is performed for float point images. They always are displayed in Full Range.

Suggestion:

Change Minimum Value and Maximum Value members of Conversion Policy cluster from I32 to SGL and make it functional for float point images as well. The same with Property Node for Vision Display.

References:

IMAQ WindDisplayMapping VI

How Are Floating Point Images Displayed in NI-Vision?

[X.]

Let's clarify why the current (it's been at least 4 years) situation is bad: when the SGL image is displayed in an IMAQ Control (the problem is identical to that described by the OP, whio was referring to external display windows), the user can be provided with useful information about the raw data in the image by moving the cursor around the image. You get something like this:

where the pixel value is indicated after "Float image".

If you want to define your own display palette, you have to create a DIFFERENT image, where all pixels below the minimum value and above the maximum value are set to those values (check the links posted by the OP). Then display this modified image, which means that moving the mouse around the image will now display bogus values for all pixels which were below the min value or above the max value in the original image.

Of course, you can work around this problem by creating your own information string indicator and fill it with the correct information, but we shouldn't have to do that.

[Darren]

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